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This extinction is known as the K/T extinction which is famous for the death of dinosaurs. This is the main major extinction responsible for all living animals related to the dinosaurs and dinosaurs themselves. This was caused by flood basalt, eruptions that affected the world's climate, drastic sea levels. But the MAIN cause for this extinction was a HUGE asteroid that hit in Mexico. This took place 65 million years ago and obviously affected all of Earth. This is the most well known and drastic extinctions to ever happen.

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This extinction was a mix. Many species of animals died due to this extinction including; marine reptiles, large amphibians, reef- building creatures, and cephalopod molluscs. Causes to be said for this extinction were; climate change, flood basalt, eruptions, and asteroid impact. This was a worldwide mass extinction and happened 200 million years ago. It wasn't the worst extinction but it did wipe a good amount of species.

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This mass extinction is known for the Great Dying. They say this extinction almost ended life on Earth. This mass happened to wipe 90% of species and only less than 5% of animal species in seas survived. On land less than a third of large animals survived. It is said that the Permian Mass Extinction was caused by acid rain following a massive release of volcanic gases. Since it was such a deadly extinction it happened all over the world. This extinction happened 251.941- 251.88 million years ago.

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No one is quite sure about this mass extinction but there are many theories too it. At this extinction, there were many species living. The creatures affected the most by this mass extinction were sea creatures. 3 quarters of species on earth died. This took place 359 million years ago. There have been many theories on why this extinction happened but some of them include, asteroid impacts, global anoxia, plate tectonics, sea level changes, climate change, and possibly volcanic action. it doesn't really mention where this extinction took place but it would've had to take place all around the world.

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The changing of the structure of a gene.

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V- Variation= Mutation
I- Inheritance= DNA and sexual selection
S- Selection= Selection and genetic drift
T- Time= Migration/ Gene flow

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Differences in molecular similarities (usually proteins) can be used to determine degrees of relationship between different species.

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Organisms during embryological development go through their evolutionary stages.

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Structures in some organisms that seem to have no use in one species but are useful in others.

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Parts that are similar in structure but have different uses in different species.

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Lucky v.s unlucky. Happens in every population

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Passing on of genetic information, influenced by male competition and female choice.

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Divergent, Parallel and Convergent Evolution: 

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Divergent, Parallel and Convergent Evolution: 

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Parallel= Two different species evolve similarly because of lifestyle.
Divergent= Two or more related species becoming less similar over time.
Convergent= Organisms with different ancestors become more alike.

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Movement of populations causes shift in genetic pool.

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5 Major Extinctions

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The Ordovician- Silurian Mass extinction was the 3rd largest extinction in history. During this extinction there were only sea creatures involved including; trilobites, brachiopods, and graptolites. The cause of this extinction was due to the fact that sea levels were majorly dropping. This specific extinction mainly took place in sea areas. This extinction took place between 450-440 million years ago. Two major reasons why this extinction occured was because 1) global cooling began to occur and 2) sea levels were drastically dropping.

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Alex Magana

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Eating too many= Extinction